datapath: report distinct drop reason for missed endpoint policy tailcall #32151
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The broader idea here is to isolate what kind of missed tailcall we're still seeing in CI, and make it possible to allow-list only Will probably have to backport for v1.15 as well to get reasonable CI feedback from the upgrade workflows. |
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This was referenced Apr 24, 2024
learnitall
approved these changes
Apr 25, 2024
…call
Make it easier to differentiate between
(1) a missed program-internal tailcall (as reported by tail_call_internal())
that indicates a bug in how the agent loads the BPF program, and
(2) a missed tailcall to some endpoint's policy program, that can also
occur due to inherent race conditions for packets that are in-flight
while an endpoint is being terminated.
Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
Ensure that the callers handle errors, and specify a more fine-grained drop reason. Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
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(rebase to resolve conflict in generated api) |
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gentoo-root
approved these changes
Apr 26, 2024
This was referenced May 2, 2024
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Improve the reporting of missed tailcalls for policy programs. While any missed tailcall in the program-internal flow (ie what's driven by
tail_call_internal()) points at a genuine loader bug, the policy tailcalls need to deal with race conditions due to eg terminating endpoints. Having distinct drop reasons makes it easier to diagnose the specific drop, and potentially allow-list them.